Cutter chain



lan improved kerf-cutting means.

Patented Oct. 23,y 1945 CUTTER CHAIN Charles F. Osgood, Claremont, H., assignor to Sullivan Machinery Company, a corporationof Massachusetts Application November 1, 1940, Serial No. l363,924

18 Claims. This invention relates to kerf-cutting means, and more particularly to improvements in cutter chains especially designed for use in the cutting of kerfs in coal and embodying improved supportingiand holding means for the cutter bits.`

An object ofthe present invention is to provide Another object is Jto provide an improved cutter chain especially designed for use in the cutting of kerfs in coal. A further object is to provide an improved supporting and holding means for the cutter bits of a cutterrchain. Yet another object is to provide Van improved cutter bit holder. A still further object is to provide an improved cutter -bit holder for a cutter bit of the double-ended, reversible type, commonly known as a throwaway bit. Still another object is to provide an improved cutter'bit holder adapted to use in a chain block of a standard cutter chain. Yet another object is to provide an improved detachable lbit holder having a pivoted bit holder part for holding 'the cutterbit in cutting position in the holder. Still another object is to provide an improved detachable bit holder having a pivoted bit holder part engageable with an exterior surface of a 'chain block wholly outside of the block sock-l et 'for holding a cutter bit in cutting position inthe holder. Still another object is to provide an improved bitholder comprising a pair of cooperating Ahinged holder parts. A further object is to e provide an'improved cutter bit holder which is simple Vin design and rugged in construction.

showing another modified form 'of the invention. Fig. 9 is a sectional view, similar to Fig. 3,

showing still another modified form of the inl socket is preferably generally rectangular in cross section 'and at its inner end opens into a, transverse opening d. .'The chain block is threaded at" 5 for thev reception of a standard set screw 6.'

The improved Vbit holder, in the embodiment of the invention'shown in Figs. 1 to 6, inclusive,

Other objects and advantages of the invention will, however, hereinafter more fully `appear in the course of the ensuing description.

In the accompanying drawing there are shown for purposes of illustration several forms which the invention may assume in practice.

In this drawing:

Fig. 1 is a side elevational view of a cutter chain with which an illustrative embodiment of the invention is associated.

Fig. 2 is across sectional view taken on line 2-2 of Fig. 1.

Fig. 3 is a view in central longitudinal section ltaken on line 3 3 of Fig. 2.

Fig. 4 is a detail sectional view taken substantially on line 4-4 of Fig. 1.

Fig. 5 is a detail sectional view taken substantially on line 5-5 of Fig. 1.

Fig. 6 is a perspective view of the improved bit holder.

Fig. 7 is' a sectional view, similar to Fig. 3, showing a modified form of the invention.

'Fig'. 8 is a sectional view, similar to Fig. 3,

is generally designated l and has a head 8 and an integral `shank 9, the latter being of rectangular cross4 section for reception in the chain block socket 3. Extending .obliquely through the holder headvis a socket l0, herein vpreferably of polygonal 'cross' section, adapted-to receive a cut'- ter bit, generally designated! I, of a convention-l al design. 'l Secured within the holderfhe'ad and traversing' the bit-re'ceiving'sooket is a hardened metal cross ypin l2, and `pivotally mounted on projecting ends yoi this pin are the side arms I3 ofy a front h'older'par't l4,'hereinin the form of a bit clamp, Aand thefsides of the holder. head are preferably cut away at l5 to receive the side arms i3, in themanner shown. The ends of the cross pin are preferably'headed or peene'd. over to retainth'e side arms of the hinged front holder partin position thereon. l

The' cutter bit lhshownmost clearly in Figs. 3 andY 4, may be of, the same general type as that 'shown .inthe'patent to Ross 2,020,215, although the bit shaDL may assumevarious conventional forms'without departing from the spirit of the invention. A'Ifhecutter bit disclosed herein isof triangularpsliape iniside elevation and of Vpolygona'l' cross section and'has plane cuttingfaces I6, t6' formed, so tO speak, one at each'of the equal sidesof the triangle; andthe cutting faces, at lthe,extremities of the `cutter bit, -t'err'ninate in cutting points l1, l1. ",Ihe plane cutting faces I6, IB A.are 4of elongated diamond shapeand are individually symmetrical as to, both major and minor axial lines. This cutter bit is. of the'gsocalled .throw-away type Jand, when yboth cuttingpcints become dull, may be discarded due to its extremely inespensive design.

The cutter bit is insertible in the socket I f the holder head with its inner, inactive cutting face resting against the cross pin I2. The cross pin therefore serves two purposes in that it acts both as an abutment for the cutter bit and a pivot for the front holder part I4. The pivoted front holder part I4 has a surface I8 engageable with the inner portion of the active cutting face of the cutterbitiand a surface I9 ,engageablewith the exteriorsurface of the chain block outside' of the block socket.

When the holder shank 9 is inserted in th'echain block socket 3, the surface I9 of the hinged front holder part I4 engages the exterior block surface 2D, so that upon further insertive movement 0f the holder shank in the block socket, the

surface I8 of the front holder part engages the inner portion of the active front cutting face of the cutter bit to hold the latter in cutting position in the holder head socket with its inner, inactive cutting face ,resting firmly against 4the cosslpi I2. Thesetscrew 6 is'then adjusted intoefr'lagelne'nt'with' the holder shank for firmly securing theY holder in position onA the chain block. It is accordingly evident that the hinged front holder part I4 is swingable outwardly into engagementwith the front 'cutting face of the bit to' prevent exit ofthe cutter'bit from the holder head socket, and is swingable inwardly out of engagement with the cutter bit to permit for- Wardendwise release ofthe bit from the holder headsocket. Y

The several modified embodiments of the invention 'shown in Figs. '7; 8r and 9 are broadly similarto that described above; In these embodiments, however, the 'set screw opening 2l in the chain block22 vis' inclined with respect to the path'oftravel'of the cutter chain to enable the inner endof Vthe set Vscrew to engage an'inclined surface 23.v on a, holder Vshank 24 so that when the setjvjscrew .'is tightened Vthe holder. sh'ank will Vbe forcedl nwardlywithin the holder block socket. In Fig. 7 "a holderfhead 25 has a front'rcess 26 foi-'receiving a' cutter bit, generally designated 21.` This cutter'bit iso'f trape'zoidal shape in side elevationfand' has cutting 'points 28, 28 at its opi posite end'sf,',thesepoints being formed 'atth'e'e'xtremitiesicfe. front plane, cutting' face 29,. The pivot :pin for'. a front holder part 3l, in this instance,' does not' Vserve as a bit abutment, and

an abutmentsurface'32 on'the holder head. The'V pivot pin -3Ilis' secured within the holder h'ead. and is spaced vrearwardly from` the Vfront bitabutment surface 32 in the' manner shown. The Y hingedfront holder part 3l, asin the form of the invention above described, serves as a bit clamp and has a surface 3.3 engageable-with the frontjbitface Y29 'and a 'surface v34 Vengageable with the exterior of theichain block. When the set screwisitightened., theholder shank isforced inwardlywithin th'e chain block socket and the pivoted front holder part, due to its engagement with the exterior surfaceofthe chain block, engages the cutter ibit to clampthecutter bit firmly against release from 'the holderhead recess. In Fig. 8 thefcutter bit, generally. designated 35, is crescent shaped and h'as acurved rear surface 36 and a plane 'front cutting face 31, the latter terminating at the opposite extremities of thebit in cutting points 38,V 3,8. The forwardcutting face 31 of A,thebit is" notched atV 39 midway lbetween thecutting points, and the pivoted front holder part 40,'which is pivoted. on a cross pin'4I secured Within the'gholder head 42, hase. portion the' inner, ,inactive 'end'ofthe 'cutter bit 'engages bit against endwise displacement from the holder. The rear curved surface of the cutter bit is seated within a recess 44 at the forward side of the holder head. When the set screw is tightened, the holder shank 42 is forced inwardly within the chain block socket and the pivoted front holder part, due to its engagement with the exteriorv surface of thechain block,v engages the cutter bit-Withits portion 43 received4 in the bit notch 39, so that the cutter bit is firmly held in cutting position within its recess 44 in the holder h'ead. In Fig. 9 a bit-receiving socket 45 extends obliquely completely through the holder head. 46, so that the rear, inactive cutting end of a cutter bit, generally designated 41, extends rearwardly through the socket into engagement with the exterior surface of the chain block at the rear side of the block socket. The cutter bit, in this'in'st'ance, is of trapezoidal shape in sideelevation ,and has relatively inclined plane cutting facesj48,`148, lying in the sides of a dihedral angleV and terminating in cuttingpoints 49, 49 at head socket, 'and the pivoted'. front holder part A 'iILwhich is hinged" at "5I on the' holder head,

has a surface 52'engag`e`able w'ith'the inner portion of the active cutting `face`of the bit, Yto prevent forward exit of the'bitffrom theY holder socket." "Thepivoted front clamp part has a surface 53 'engageable With the exterior surface of the chain' block at the forward side of the block '35,4 socket. 'The inner, inactive cutting facefof the V:cutter bit rests firmly against the exterior surface of thejchain block, and ,when the set screwis tightened the holders-'bank 54 isfocd inwardly within the block socketv and,'due to the engage- 4Qqm`ent ofthepivoted front holder part' with vthe exterior Ysurfac'ebf thechain block,"'the surface 52' on'the h'older part'en'gages Vthe inner portion of the active cutting face of the bit to clamp the cutter bit firmly in Ycutting position. As in Figs'.

* '7 and' 8, the 'cross pinjsecured within the holder "'headserves' only asa hinge pin. Alsoi'n" these threemodied embodiments, the set screw when tightenedjeflects automatic clamping 'of the cutterjbitrmly inrcutting position with.a`vise-like y action',V since `insertive movement Vof 4the holderl shank 'within the block socket automaticallyI effects' tightening Yof the front holder part; Otherwise the embodiments' 'of the/invention shown in Figs. 7, Sand 9 are similar to that shown in Figs. Ito 6, incusive.V

As a result; of VVtliiginvention, it will` be noted thatan improved kerf-cutting..cutter` chain is provided having improved cutter,- bit supporting and holding means for firmly ,sii-moorting' and holding aV cutter bit in cutting position` on a chain block. jfItwill further benoted that by the pro`r` vision of the'improvedcutter'bit holder embodying a hinged from;` holder part engageable with the exterior of the chain block wholly outside of therblocksocket, the cutter bit is firmly `clamped in cutting position on the block. It will further be noted that-in the several'jembodiments ofthe invention, .the cutter bit holderis of an extremely simpleV and inexpensive design `4andnlay be used in astandard chain block Other uses and' ad'-- vantages of the invention 'willberclearly appar-fv ent to those skilled in the art.

WhileA there arein this application specifically described'several f orrnsY which the invention may assumeinpractice, ity/illnbeunderstood that 43 receivable in the bit notch to hom the cutter assaggi;

these forms of the same areshown forfpurposes of :illustration and that the invention. may :he embodied in f various other: forms Without departirigfrom its spirit or thefscope :of `the :appended claims.

What -I .claim as 4new and desire to `secure 'by Letters Patent is:

1. A detachable cutter bit holder ladapted for mounting on a chain block of a-cutter chain, comprising a head and a shank, thev latter adapted for reception in a chain block socketand said head having afb-it-reoeiving socket, and a front holder 'parthingedly connected at one endfto Said holder head at the outerend-of the Vholder and engageable at its o-ther end with a cutter vbit received in said head socket -for holding a cutter bit in cutting position within-said head socket.

2. A detachable cutter bit holder comprising .a head and a shank, said head having abit-receiving socket, a front holder part hinged tosaid holder head and having a surface engageable with a cutter bit received in said socket for holdin-ga cutter bit in cutting position withinsaid socket, and a cross p-in fixed within said holder head and traversing said socket, said pin serving as an abutment for the inner end of `a cutter bitreceived in said socket and also as a pivot for said hinged front holder part.

3. A detachable bit holder adapted lfor mounting on a chain block of a cutter chain, .comprising a head and an integral shank, the latteradapted for reception in a socket of a chainblockand said head having a socket adapted to receive a cutter bit, and a, front holder part hingedly connected t said holder head at the outer end of'therholder, the hinge located near the rear side of said holder shank, said hinged front holder `part swingable about its hinge into engagement with ,a cutter bit in said head socket and engageable Iwith a chain block for holding a cutter bit against release from said head socket.

4. A cutter-bit-holding `means comprising .a member having a socket adapted to-receiveiia cut ter bit, a cross pin secured to said member and traversing said socket and against which a cutter bit received in said socket is adapted to rest, and a bit-holding member pivotally mounted on said pin and engage'able with a cutter bit in said socket for holding the bit against release from said socket.

5. A cutter bit supporting and holding means comprising a holder member having al socket adapted to receive a cutter bit, a holder part hinged to said holder member and adapted to engage a cutter bit received in said socket for preventing release of the bit from said socket, and an element secured to said holder member and traversing said socket and providing an abutment against which a cutter bit received in said socket is adapted to rest, said abutment-providing-element also providing a pivotal mounting for said hinged holder part.

6. In a cutter chain, the combination with a chain block having a socket, of a detachable 'oit holder having a shank receivable in said block socket and an integral head disposed outside of said socket, said head having a recess for receiving a cutter bit, and a holder part hinged at one end to said holder head at the outer end of the holder and at its other end engaging the exterior surface of said chain block outside the block socket and at said latter end engageable with a bit in said head recess for preventing release of the bit from said recess.

7. In a cutter chain, the combination with a chain block :having a, socket, of abitrholderl comprising pivotally connected holder parts cooperating Vto secure a cutter bit in cutting position on vsaid block and means for pivotally-connecting said holder parts at the bit-*securing end of the holder, one of said holder .parts having a shank received in said block socket and the other holder part engageable at the end thereof remote from its pivot lwith'an exterior surface of said chain .block .Wholly outside of said block socket when the holder is 'in bit holding positon with respect to the block.

y8. In a cutter chain, -thecombination .Withva chain block having a socket, of'a bit holder comprising pi-votally connected holder-parts cooperating to hold'a cutter bit in cutting position on the chain block, and means at .the outer end "of the holder for pivotally connecting said parts, one of said parts having Ia shank receivable in said block socket and the other part disposed wholly outside of said'blockfsocket vand engageable at the end thereof remote from its pivot with an exterior surface on the chain block when the holder vis in bit holding position with respect toftherblock.

9. In a cutter chain, the .combination with a chain'block having a socket, of a bit holder for holding a lcutter bit in cutting position .on the chainv block comprising cooperating lbit holder parts hinged together, and means at the outer i end of theholder for hingedly connecting `said parts, one -of said .parts having a portion `receivable in said block Asocket and the other 'of said parts being disposed wholly outside of the block socket and engageable at the end thereof yremote from its hinge withan exterior surface on the chain block when theholder is in bit holding position with respect to the block.

10. In a cutter chain, the combination with a chain block havinga socket, of a bit holder for 'securing a cutter bit in cutting position on said chain block comprising cooperating bit holder parts hinged together, and meansat the outer end4 of the holder for hingedly connecting said parts, one part having a socket adapted to receive a cutter bit-and a portion receivable in said block socket and the other part having at the end .thereof remote from its hinge spaced sur- Lfaces one engageable with a cutter bit in said bitreceiving socket and the other surface engageable with an exterior surface on said chain block, said latter part being disposed wholly outside of said block socket when the holder is in bit holding position with respect to the block.

11. In a cutter chain, the combination with a chain block having a socket, oi a bit holder receivable in the block socket for holding a cutter bit in cutting position on the chain block comprising a pair of cooperating holder parts hinged together, and means at the outer end of the holder for hingedly connecting said parts, one part having a bitreceiving opening extending therethrough, and a cutter bit received in said opening with its rear end resting on an exterior surface of said chain block, and said other part engaging an exterior surfacer on the chain. block Wholly outside of the block socket when the holder is in bit holding position, said latter part engaging said cutter bit for holding the latter against endwise release from said opening.

12. In combination, a cutter-bit-holding means comprising cooperating holder parts hinged together at the outer end of the holding means, one part having la recess for receiving a cutter bit, and a cutter bit received in said recess and having a notch, said other holder part having a portion received in said bit notch for preventing release of said bit from said recess.

. 13.v In arcutter chain, a `chain .block havingal socket, andrholder means. for securing a cutter bit in cutting position on said block comprising' cooperating, relatively swinlgable holder partsv hinged together at the outer end of the holder means, one part having a portion disposed in said block socket and the other part swingable at one end about its hinge and disposed Wholly outside of said block socket when the holder means is inl bit holding position. 1 Y

- 14., In ,a cutterchainga chain block having a. socket, and, holder means for securing aV cutter bit in cutting position on said block comprising cooperating holderiparts hinged together at the' outerend of the holder means, one part having the holder means in in bit holding position. I

l5. A detachable bit holder adapted or mounting on a chain block of a cutter chain, comprising a head and a shank, the latter adapted for reception in a socket of a chainblo'ck and said head having abit-receiving recess, a double-pointed reversible cutter bit seated said head recesswith a cutting point projecting outwardly therefrom in position to cut, and a member hingedly connected at one end to said head at the outer end of the holder in adjacency to said bit-receiving recess, said hinged member operable to engage at its other end a portion of the projecting cutting'point for preventingl displacement of the bit fromk its recess. Y Y

16. A detachable bit holder adapted `ior mounting on a chain block of a cutter chain, comprising a holder member having a bit seat, a doubleponted reversible cutter bit seated'in said holder member with a cutting point projecting forwardly and upwardly in cutting position with said projecting point presenting a flat front face inclining slightly downwardly and rearwardly from tion.

the extremity of .the cutting point, and a member hingedly connected to said holder member at the outer end of the ,holder in. adjacency to the bit seat,. the'hinge axis located on the holder in ad- 5;, Vance of .the rearmost point of contact of the :bit

with the bit seat and said hinged member swingable upwardly about its hinge upon insertion of the holder shank into a block socket to engage a portion of said front bit face to block exit of the lbit from its seat.

17. A detachable bit holder adapted for mounting on a chain block of a cutter chain, compris' ing a head and a shank, the latter being adapted' for reception in the socket of a chain block and 15. adapted for engagement by securing means en the block, said head having a bit-receivingrecess, a double-pointed reversible cutter bit seated in said head recess'with a cutting point projecting outwardly therefrom in position to cut, and a 2Q;member hingedly connected to said head at the outer end of the holder in adjacency to said head recess, the hinge located on the holder at a point outside of the point. of engagement of the securing means with said shank, said hinged memy25-;ber engaging said bit upon insertive Ymovement of the holder shank in a socket of a chain block.

18. A bit holder adapted for mounting on a' chain block of a cutter chain, comprising a head and a shank, the latter being adapted for re- 30.;'.ception in the socket of va chain block and said 3.5..':ment hingedat one end to said head at the outer end of the holder. and having spaced abutmentk surfaces at its other end, one vvoi said abutment surfaces adapted for engagement with an exterior surface of a chain block and the other abutment surface engageable with the projecting portion of said cutter bit, said hinged element swingable on its hinge into and out of bit-securing engagement with said projecting bit por- CHARLES F. OSGOOD. 

